This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X475S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40X475S
The AirTAC Airtac SI40 Standard Cylinder SI40X475S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 475mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X475S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X475S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40X475S
The AirTAC SI40X475S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40 mm bore and 475 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X475S, a direct replacement retaining the exact ISO 15552 mounting interface, stroke, and output force.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For this magnet-equipped (-S) model, legacy CS1-B/DS1-B switches fit the sensor groove, while the SAI family accepts current AirTAC sensors.
Airtac SI40 Standard Cylinder SI40X475S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X475S |
| Bore size | Ø40 mm |
| Stroke | 475 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X475S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X475S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X475S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×475 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40X475S Is Used
Carton Diversion
Drives a 475 mm stroke diverter arm on packaging lines to route standard cartons without overwhelming the 628 N push capacity.
Vertical Material Lift
Elevates lightweight component trays up to 32 kg in assembly cells, utilizing the long stroke for ergonomic loading heights.
Parts Ejection
Pushes machined aluminum parts out of a CNC enclosure, relying on adjustable end cushions to decelerate the 475 mm travel safely.
Replacing the Airtac SI40 Standard Cylinder SI40X475S with the SAI40X475S
To replace the SI40X475S, specify the SAI40X475S and verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/4 port thread (PT/G/NPT), and the M12x1.25 rod thread. The -S suffix confirms the piston magnet is present for position sensing. Sizing both ways: this 40 mm bore gives 628 N push at 0.5 MPa, whereas a 32 mm bore offers 402 N, and a 50 mm bore provides 982 N. Because the 475 mm stroke is long, use an external guide to prevent rod bending and side-load damage. The air cushion only decelerates the load; it does not hold position on air loss, so add a pilot check valve or explore the SAIL/BSAI lock variants for secure load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X475S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X475S FAQ
Yes, the AirTAC SI40X475S is discontinued. The direct replacement is the SAI40X475S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 475 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
This 40 mm bore cylinder features a G1/4 air port and M12x1.25 rod thread. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X475S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X475S replacement — usually within 7-8 hours.